Fourths to henry e



(No Model.)

W. H. THOMPSON.

ALARM LOOK.

No. 597,207. Patented Jan. 11,1898.

INVENTOR V 6? J9d 4 m ttarney WITNESSES UNITED STATES PATnN'r tries.

XVILLIAM H. THOMPSON, OF ARCADIA, FLORIDA, ASSIGNOR OF THREE- FOURTI-IS TO HENRY E. CARLTON, OXVEN H. DISIIONG, AND WILLIAM A. HENDRY, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 597,207, dated January 11, 1898.

Application filed August 30, 1897.

To (all whom it may concern.-

Be it known that I, WILLIAM H. Tnoursos, a resident of Arcadia, in the county of De Soto and State of Florida, have invented certain new and useful Improvements in Alarm- Locks; and 'I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use .the same.

My invention relates to an improvement in alarm-locks, the object being to provide a simple and efficient lock which will preclude the unlocking of same Without sounding an alarm.

With this object in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the claim.

In the accompanying drawings, Figure 1 is a view with the coverremoved. Fig. 2 is a front edge view, and Figs. 3, at, and 5 are views of details.

A. represents the casing of a lock; and it consists, mainly, of a back plate 1, side pieces 2 2, top and bottom plates 3 3, and the removable front plate at. In the inner faces of the side pieces 2 2 grooves 6 6 are formed, and a slotted plate 7 is held in these grooves.

B represents my improved latch-bolt, which is located in the lower part of the casing A, its beveled end adapted to extend through a slot 9 in side 2 and provided with a shoulder 10 to limit its outward movement. The rear lower portion of said latch-bolt is cut or hollowed out in semicircular form in cross-section, as at 6, to receive one end of a coiled spring 11, adapted to normally hold the latchbolt in its projecting position. A pin or projection 12 upon the inner face of side section 2 is provided for the reception of the other end of the spring 11, whereby to secure same in its desired position.

The latch-bolt B is provided with a cutaway portion 13 for the reception of a key it, operated by the usual knob or T-handle 15. A partition 16 is provided above the latchbolt B to hold the same and the lock-bolt O in their desired positions. One end of said Serial No. 650,024 (No model.)

lock-bolt C is adapted, when in its locked position, to extend through a slot 17in the side piece 2 and has provided thereon a shoulder 18 to limit its outward movement. The lower edge of said bolt 0 is cutaway, as at 19, for the reception of the usuallockingkey, (indicated in dotted lines in Fig. 1,) which is inserted through the ordinary keyhole 20. The upper edge of said bolt 0 is cut away, as at 21, to form the gradually-tapering stop, whereby to regulate the movement of a spring-catch 8, secured at one end of the partition-plate 7 and sprung against the cut-away portion of the bolt and extending upwardly through slot 22 in said partition-plate and engaging with the teeth of a ratchet-wheel D when the bolt is in its locking position. The hub of the toothed wheel D is provided with teeth or cogs 23 to engage with the teeth or cogs 24: of wheel E. Said wheel E is provided with an ordinary clock-spring F, which may be wound by means of a key G outside the casing A. A bell or gong H is secured to the upper portion of rear plate 1 and is provided with the usual clapper 26. To the lower end of said clapper a pallet 25 is secured, whereby to en gage the teeth on the wheel D. Thus it will be seen that when the lock bolt is in its locked position the spring-catch 8 is in engagement with the teeth of wheel D, but when the lock-bolt is unlocked the spring-catch springs away from the teeth of wheel D and permits clock-spring F to unwind, thus revolving wheels E and D at a very rapid rate. The teeth of wheel D engage the pallet 25, and hence vibrate the clapper 26 and ring the gong or bell continuously until the spring is unwound.

Thus it will be seen from the above that it would be impossible to unlock the device without giving an alarm; but it is to be understood that, if it is desired, the spring need not be wound up, and hence the lock can be unlocked without any alarm being given.

Various slight changes might be made in the various details of construction herein shown and described without departing from the spirit and scope of my invention, and hence I would have it understood that I do not limit myself to the precise details herein shown and described, but consider myself at liberty to make such changes and'alterations as fairlyfall within the spirit and scope of free end is held by the bolt normally in en gagement with teeth of the ratchet-toothed wheel when the bolt is thrown out in the position of looking and drops away from the teeth of the Wheel when the bolt is withdrawn.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

XVILLIAM H. THOMPSON.

Witnesses J. L. JONES, W. F. HANCOCK. 

